A168561 - cp's OEIS frontend

A168561 Riordan array (1/(1-x^2), x/(1-x^2)). Unsigned version of A049310.

n	a(n)
0	1
1	0
2	1
3	1
4	0
5	1
6	0
7	2
8	0
9	1
10	1
11	0
12	3
13	0
14	1
15	0
16	3
17	0
18	4
19	0
20	1
21	1
22	0
23	6
24	0
25	5
26	0
27	1
28	0
29	4
30	0
31	10
32	0
33	6
34	0
35	1
36	1
37	0
38	10
39	0
40	15
41	0
42	7
43	0
44	1
45	0
46	5
47	0
48	20
49	0
50	21
51	0
52	8
53	0
54	1
55	1
56	0
57	15
58	0
59	35
60	0
61	28
62	0
63	9
64	0
65	1
66	0
67	6
68	0
69	35
70	0
71	56
72	0
73	36
74	0
75	10
76	0
77	1
78	1
79	0
80	21
81	0
82	70
83	0
84	84
85	0
86	45
87	0
88	11
89	0
90	1

[1, 0, 1, 1, 0, 1, 0, 2, 0, 1, 1, 0, 3, 0, 1, 0, 3, 0, 4, 0, 1, 1, 0, 6, 0, 5, 0, 1, 0, 4, 0, 10, 0, 6, 0, 1, 1, 0, 10, 0, 15, 0, 7, 0, 1, 0, 5, 0, 20, 0, 21, 0, 8, 0, 1, 1, 0, 15, 0, 35, 0, 28, 0, 9, 0, 1, 0, 6, 0, 35, 0, 56, 0, 36, 0, 10, 0, 1, 1, 0, 21, 0, 70, 0, 84, 0, 45, 0, 11, 0, 1]

cp's OEIS Frontend

A168561 Riordan array (1/(1-x^2), x/(1-x^2)). Unsigned version of A049310.

Table of values

List of values

n	a(n)
0	1
1	0
2	1
3	1
4	0
5	1
6	0
7	2
8	0
9	1
10	1
11	0
12	3
13	0
14	1
15	0
16	3
17	0
18	4
19	0
20	1
21	1
22	0
23	6
24	0
25	5
26	0
27	1
28	0
29	4
30	0
31	10
32	0
33	6
34	0
35	1
36	1
37	0
38	10
39	0
40	15
41	0
42	7
43	0
44	1
45	0
46	5
47	0
48	20
49	0
50	21
51	0
52	8
53	0
54	1
55	1
56	0
57	15
58	0
59	35
60	0
61	28
62	0
63	9
64	0
65	1
66	0
67	6
68	0
69	35
70	0
71	56
72	0
73	36
74	0
75	10
76	0
77	1
78	1
79	0
80	21
81	0
82	70
83	0
84	84
85	0
86	45
87	0
88	11
89	0
90	1

n	a(n)
0	1
1	0
2	1
3	1
4	0
5	1
6	0
7	2
8	0
9	1
10	1
11	0
12	3
13	0
14	1
15	0
16	3
17	0
18	4
19	0
20	1
21	1
22	0
23	6
24	0
25	5
26	0
27	1
28	0
29	4
30	0
31	10
32	0
33	6
34	0
35	1
36	1
37	0
38	10
39	0
40	15
41	0
42	7
43	0
44	1
45	0
46	5
47	0
48	20
49	0
50	21
51	0
52	8
53	0
54	1
55	1
56	0
57	15
58	0
59	35
60	0
61	28
62	0
63	9
64	0
65	1
66	0
67	6
68	0
69	35
70	0
71	56
72	0
73	36
74	0
75	10
76	0
77	1
78	1
79	0
80	21
81	0
82	70
83	0
84	84
85	0
86	45
87	0
88	11
89	0
90	1

n	a(n)
0	1
1	0
2	1
3	1
4	0
5	1
6	0
7	2
8	0
9	1
10	1
11	0
12	3
13	0
14	1
15	0
16	3
17	0
18	4
19	0
20	1
21	1
22	0
23	6
24	0
25	5
26	0
27	1
28	0
29	4
30	0
31	10
32	0
33	6
34	0
35	1
36	1
37	0
38	10
39	0
40	15
41	0
42	7
43	0
44	1
45	0
46	5
47	0
48	20
49	0
50	21
51	0
52	8
53	0
54	1
55	1
56	0
57	15
58	0
59	35
60	0
61	28
62	0
63	9
64	0
65	1
66	0
67	6
68	0
69	35
70	0
71	56
72	0
73	36
74	0
75	10
76	0
77	1
78	1
79	0
80	21
81	0
82	70
83	0
84	84
85	0
86	45
87	0
88	11
89	0
90	1